WO2016134787A1 - Composition d'alliage d'argent - Google Patents

Composition d'alliage d'argent Download PDF

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Publication number
WO2016134787A1
WO2016134787A1 PCT/EP2015/054157 EP2015054157W WO2016134787A1 WO 2016134787 A1 WO2016134787 A1 WO 2016134787A1 EP 2015054157 W EP2015054157 W EP 2015054157W WO 2016134787 A1 WO2016134787 A1 WO 2016134787A1
Authority
WO
WIPO (PCT)
Prior art keywords
silver
weight
alloy composition
alloy
silver alloy
Prior art date
Application number
PCT/EP2015/054157
Other languages
German (de)
English (en)
Inventor
Udo Rabe
Original Assignee
Ögussa Österreichische Gold- Und Silber-Scheideanstalt Ges.M.B.H.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ögussa Österreichische Gold- Und Silber-Scheideanstalt Ges.M.B.H. filed Critical Ögussa Österreichische Gold- Und Silber-Scheideanstalt Ges.M.B.H.
Priority to PCT/EP2015/054157 priority Critical patent/WO2016134787A1/fr
Publication of WO2016134787A1 publication Critical patent/WO2016134787A1/fr

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C5/00—Alloys based on noble metals
    • C22C5/06—Alloys based on silver
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C5/00—Alloys based on noble metals
    • C22C5/06—Alloys based on silver
    • C22C5/08—Alloys based on silver with copper as the next major constituent
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/14—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of noble metals or alloys based thereon

Definitions

  • the invention relates to a silver alloy composition and its use for the production of jewelry and carcass.
  • silver is used as a material for making jewelry and others
  • Sterling silver typically comprises an alloy of 92.5 weight percent silver, the silver being usually alloyed with copper as well as traces of other metals and elements as additives for hardness and other desirable properties.
  • compositions show reduced porosity, grain size and
  • compositions impart antioxidant properties and reduce the formation of silver and copper oxide which results in pore formation in the cast or remelted alloys.
  • Alloys have poor cold curing properties and thus do not reach the mechanical strength and hardness of conventional sterling silverware.
  • DE 4213897 proposes an Ag-Cu alloy containing 0.5-3 wt. Germanium. This alloy has improved hardness, ductility, and tensile strength, and less quickly becomes dull or black than classic Ag-Cu alloys due to the appearance of preferential sulfurization of germanium over silver.
  • GB 2 355 990 and GB 2 414 739 teach Ag-Cu-Ge alloys containing as additives for example Sn, Sb, Si, Ni, In or also Ir and Fe. This extra
  • WO 95/14112 discloses a silver alloy containing 89-95% by weight of Ag, 0.5-6% by weight of Cu, 0.05-5% by weight of Zn, 0.02-2% by weight. Si, 0.001-2% by weight B, 0.01-1.5% by weight In, 0.01-2.5% by weight of Ge and 0.25-6% by weight of Sn, which are a increased tarnish resistance and a reduced porosity and grain size with improved cold forming properties.
  • Precision casting provided either 93.5 wt .-% Ag, 1.1 wt .-% Ge, 700 ppm Si, 3-60 ppm B, with the balance Cu, or 96 wt .-% Ag, 0.65 wt % Zn, 0.7 wt% Ge, 700 ppm Si, 3-60 ppm B, with the remainder Cu, and having a spotless silver appearance and reduced or eliminated shrinkage porosity.
  • US 2010/0239454 discloses an Ag-Cu-Ge alloy which consists of more than 93.5% by weight to 95.5% by weight of Ag, from 0.5 to 3% by weight of Ge, 1 -40 ppm of B, optionally 0.5% by weight of Zn, Cd and Sn, optionally 0.1-1% by weight of Si and the remainder, besides impurities, copper, wherein the weight ratio of Cu to Ge of 4: 1 to 3: 1.
  • the alloy is against the emergence of porosity and brittleness, the emergence of
  • the object of the invention is to provide a silver alloy composition
  • the silver alloy composition according to the invention in comparison to the conventional and known tarnish-optimized Ag alloys has a smaller amount of pores and voids and thus a denser cast structure, thus having a significantly better castability or casting quality.
  • the fiction, contemporary silver alloy composition has a significantly improved tarnish resistance to sulfur-containing media, as the black color is delayed and starts at the same load duration to a lesser extent than in alloys of the prior art.
  • a hardness increase to about HV2 110-120 can be achieved.
  • the surface wear of silver jewelry, such as rings, brooches, etc. significantly reduce.
  • Silver alloy composition 0.15 wt.
  • the In content is in the fiction, contemporary
  • Silver alloy composition 0.07 wt.
  • the B content in the silver alloy composition of the present invention is preferably 0.0030 wt%.
  • the P content in the fiction, silver alloy composition is preferably 0.0070 wt .-%.
  • the silver alloy composition contains 94.00 wt% Ag, 3.93 wt% Cu, 0.23 wt% Ge, 0.04 wt% Si, 1.50 wt% Zn , 0.15 wt% Sn, 0.07 wt% In, 0.07 wt% Ga, 0.0020 wt% B and P as the balance.
  • the invention relates to the use of the above
  • the silver alloy composition of the invention for the production of jewelery, especially in investment casting, and carcass.
  • the silver alloy composition of the invention is particularly advantageously suitable.
  • the silver alloys containing the composition according to the invention are produced by a melt-metallurgical process in which individual components and partially pre-alloyed components (CuB, CuSi, CuZn) are melted, preferably by means of inductive low-frequency heating.
  • the melting takes place under extensive exclusion of air, by protective gases such as nitrogen or argon a protective gas.
  • Atmosphere is generated, which prevents the partial oxidation and / or depletion of the base alloy components.
  • the molten alloy is then continuously cast, wherein the melt or the solidified strand is withdrawn via a water-cooled mold as a round or square profile.
  • the further processing depends on the intended use of the alloy.
  • the processing is carried out by conventional cold forming such as rolling or wire drawing with appropriate annealing steps, by which the material is transferred after previous work hardening by microstructural relaxation or recrystallization in a soft, well deformable state.
  • the thus processed silver alloy according to the invention is suitable for use as a classic jewelry alloy for the production of Pretiosen by pressing, pressing or casting and also for the production of carcasses, such as vessels, plates, tableware and the like.
  • the alloy is made into granules by rolling and cutting into small sections of sheet (e.g., 10x10x2mm) or by a granulation process.
  • the alloy melt or the melt stream in a liquid medium, preferably water with surface-active additives, out, the formation of the granules or balls is supported by an additional stirring by means of agitator or water jet.
  • the sheet sections or granules thus produced can then be processed by casting in lost form (investment casting) to jewelry blanks, which are then brought into their final form by grinding, sanding, polishing, bending, soldering, grabbing stones, etc.
  • Silver alloy composition prepared by the method described above.
  • Table 2 shows alloy compositions of conventional silver alloys (variants 4 and 5) and alloys according to EP 2 453 028 A (variants 1-3).
  • the alloy according to variant 4 has a lower tarnish resistance as well as a higher porosity and poorer casting quality.
  • Silver alloy composition a coarse-grained texture and a worse
  • Silver alloy composition has an improved protection against these alloys.
  • test specimens used were rectangular plates of 45 ⁇ 15 ⁇ 2 mm of the following silver alloys: a) 925 silver ("sterling silver")
  • the specimens are positioned on a stainless steel net placed on a beaker (3000 ml).
  • the experiment is carried out in a digestive system with the suction switched on.
  • the test solution (in a beaker) consists of 1.40 ml of ammonium sulfide and 400 ml of dist. Water together.
  • test casting trees of 940 Alpine V6 Plus and 960 argentium were cast at a casting temperature of 1020 ° C and a cuvette temperature of 550 ° C. Subsequently, a grinding was made per trial to assess the casting quality and the structure.
  • the alloy 940 Alpine-V6 Plus ( Figure 2a) according to the invention also has a fine-grained, i.e., 960 argentium ( Figure 2b). low-pore structure on.
  • Alloy composition 940 Alpine V6 Plus subjected to various heat treatments The parameters of the heating as well as the resulting Vickers hardness (HVl) plus hardness increase in relation to the initial hardness are listed in Table 3.
  • the hardness of the alloy can be significantly increased by simple means.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Adornments (AREA)

Abstract

La présente invention concerne une composition d'alliage d'argent présentant une résistance au ternissement et une qualité de coulée améliorées, laquelle composition contient 92,5-96,0 % en poids d'Ag, de préférence 93,5-94 % en poids d'Ag, 2,27-4,96 % en poids de Cu, de préférence 2,50-4,40 % en poids de Cu, 0,19-0,24 % en poids de Ge, de préférence 0,19-0,23 % en poids de Ge, 0,04-0,05 % en poids de Si, de préférence 0,04 % en poids de Si, 1,20-1,50 % en poids de Zn, de préférence 1,30-1,50 % en poids de Zn, 0,13-0,16 % en poids de Sn, de préférence 0,14-0,15 % en poids de Sn, 0,06-0,08 % en poids d'In, de préférence 0,07-0,08 % en poids d'In, 0,0020-0,0040 % en poids de B, 0,0-0,08 % en poids de Ga, le reste étant P. En raison de ses caractéristiques, ledit alliage convient particulièrement à la production de pièces de bijouterie et d'argenterie.
PCT/EP2015/054157 2015-02-27 2015-02-27 Composition d'alliage d'argent WO2016134787A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/EP2015/054157 WO2016134787A1 (fr) 2015-02-27 2015-02-27 Composition d'alliage d'argent

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2015/054157 WO2016134787A1 (fr) 2015-02-27 2015-02-27 Composition d'alliage d'argent

Publications (1)

Publication Number Publication Date
WO2016134787A1 true WO2016134787A1 (fr) 2016-09-01

Family

ID=52672232

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2015/054157 WO2016134787A1 (fr) 2015-02-27 2015-02-27 Composition d'alliage d'argent

Country Status (1)

Country Link
WO (1) WO2016134787A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110669961A (zh) * 2019-10-18 2020-01-10 郑州机械研究所有限公司 一种高白高亮铜基补口合金

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4973446A (en) * 1990-06-07 1990-11-27 United Precious Metal Refining Co., Inc. Silver alloy compositions
DE69429193T2 (de) * 1993-11-15 2002-08-22 Apecs Invest Castings Pty Ltd Zusammensetzung einer silberlegierung
WO2006051338A2 (fr) * 2004-11-15 2006-05-18 Middlesex Silver Co. Limited Structure de tissu
WO2007023308A1 (fr) * 2005-08-23 2007-03-01 Middlesex Silver Co. Limited Fil d'argent
EP2453028A1 (fr) * 2010-11-11 2012-05-16 Argentium International Limited Alliage pour le moulage de coulée

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4973446A (en) * 1990-06-07 1990-11-27 United Precious Metal Refining Co., Inc. Silver alloy compositions
DE69429193T2 (de) * 1993-11-15 2002-08-22 Apecs Invest Castings Pty Ltd Zusammensetzung einer silberlegierung
WO2006051338A2 (fr) * 2004-11-15 2006-05-18 Middlesex Silver Co. Limited Structure de tissu
WO2007023308A1 (fr) * 2005-08-23 2007-03-01 Middlesex Silver Co. Limited Fil d'argent
EP2453028A1 (fr) * 2010-11-11 2012-05-16 Argentium International Limited Alliage pour le moulage de coulée

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110669961A (zh) * 2019-10-18 2020-01-10 郑州机械研究所有限公司 一种高白高亮铜基补口合金

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